Safety attachment and locking device for power-presses.



. s. E. Bewan; SAFETY MTACHMENLAND LOCKING DEVICE FOB POWER PHESS'ES.

' I APPLICATION FILED AIIGI'S, 1917. 1,258,525. Patented Mar. 5,1918".

2 SHEETS-,shut l.

, B. 5. B 'EYEFLj AND. LOCKING. DEVICE FOR' POWER PRESSES.

AFPLICATQM FILED. AUG. I3. 191].

Pauented Mar. 5,1918.'

2 SHEETS-SHR? 2.

sTATEs PATENT voFFroE.

BERTRAND E. BEYEB, 0F HOBOKEN, NEW JERSEY.

y SAFETY nTTAcHENT Nn vnocxme nnvrcn son mwen-PRESSES.

.To all 'whomzt may concern.

Be it known that I, BERTRAND E. Bam, 'a citizen of the United States, residing at Hoboken, in the county of Hudson and State 5 of New Jersey, have invented certain new and useful Improvements in Safety Attachments and Locking Devices for Power- Presses and do hereby declare the following to be a full, clear, and exact description ofthe invention, such aswill enable others skilled in the artto which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and gures of reference marked thereon, which forma part of th1s specification.

This invention relates to new and useful improvements in safety attachments and lookin devices for power presses and so arrange that it would be impossible to operate the press until a guard is lowered to a rotecting position. o

he invention consists in the prov1s1on ofA a guard for power presses in which means is provided for perm1tting the guard to be swung out of yplace when it is deslred to make adjustments,` setting tools, etc., the 4apparatus being .so arranged that the trip i cannot be operated until'the guard is in posi- 30 tion andwithout obstruction in its path, the trip being; locked until the guard reaches protecting. position.

invention comprises a-simple and etli- Jclient apparatus of this nature having variouys'details of construction, combinations and arrangements of parts which will be hereinatten-fully described, shown .in the accom- U drawings and then Vspe'ciiically. de- 1n the`appended claims.' y y;lVIy-invention is illustrated in the accom- Pil-1l y referencey marked thereon ing drawings which, withttheletters of Figur y1 1s 'a 51de elevat on showingfthey ,F'g. 2px san enlarged view, partially in 4.sez-ition lof the, apparatus.

'Figs 3 .'s a sectional view on line of f ..1 .Artis a detailed view in elevation of .c Fig'gs a topf plan of the guard fas- Y tened to the frame of a press'.k

Specification of I-.etters Patent.

`fOIIll a part ofthisfapplicationfand'in which.; f

Reference now being had to the details of the drawings by letter:

A designates the frame of a power press havlng a pivotal trip lever B mounted upon a pivot C and D is a spring fastened at one end to the pin D and its vother end to one end of the lever B. A bar, designated by letter E is pivoted to the trip lever B at E',

yand in turn is pivotally connected to the rod F, movable Within theguide member H,

which is fastened to the side of the frame by passing bolts through apertures H and holes in the frame. To the lower end of the rod F is fastened a yoke I, slotted as at I Patented Mar. 5, 1918. f

Appuoation med August 1s, 1917. serial No. 185,958.

A tubular shell Ql isr itted vin a.

recess in the member H at one end, and its Y other end is fastened tothe hollow shell R,

and Q designates a latch which is adapted to have longitudinal movement in an aper` ture H2 formed through the wall of said member H and through the wall of the .shell y to normally hold the beveled end of the latchy Said key T is guided inv its longitudinal movements in the key way in the notch, F.

R and has a notch R2 in the edge thereof, adapted .to receive .oneend of the latch Q", when the 'guardv is lowered lto protecting position." A guard carryin tubularmember S, which is provided with perforations` S, has a longitudinal slot S2 toreceive the key T and a'vlug T3 upon said key is adapted to engage onefor another of the perforations S', for the purpose of holding the key and 'tubular member yS in different relative posi-4 v tions according as it may be desired to hold, the guardSsl at different elevations. A stud' X projects from the member S and carries an In o eration, by pressing on the tread lever, t e lever L may be drawn down under tension of the sprin O. As the guard is operated by the lever when the latter is lowered, the guard will lower by gravity to protecting position. As the lever L'swings down and comes in contact with the lower edge, of the slot I', the yoke will be drawn down and with it the rod F. As the rod F lowers, the beveled edge of the notch therein will cause the latch Q to be released therefrom and as the guard will have reached its lowest limit before the latch is withdrawn from the notch F', the op ositeend of the latch will engage the notch F2 and lock the guard at its lowest position. As the rod F is moved downward, the trip actuating the power (press will be operated after the guard is'hel in its lowest position. When the operator releases pressure from the trip lever, the spring D will cause the rod F to be raised, so that the notch F will come into alinement with the latch, thus permitting the guard member to v be raised through the medium of A the spring O.

It will be understood that the trip rod is always pulled in place by the spring D. Should the hand of the operator obstruct the path of the guard, which may be lowered at the will of the operator, as soon as the ard touches the obstruction or hand, furt er descent of .the guard will be checked, as it moves downward by its own weight, while the-lever L will move only until it has reached the limit, governed by the length of the slot I in the yoke I. By reason of the longitudinal movement of the latch Q in one direction being limited'by the key T until the guard is lowered suiiiciently to permit registration of the notch Rz with the latch, a positive lock is alforded to the trip mechanism by reason of the latch being held in the notch of the rod F, thus preventing downward movement of the rod F and actuation of the trip lever B. y

The tubular shell S and T .may be raised to permit the offset of the keyor portion above the notch R2 to come out of t e ke way within the shell R 'and the guard at t e lower end may then be swun out of osition. The key will ride on t e top o the. shell R andv will not permit the vguard to be lowered and the press to be tripped until the adjusting key means is again properly set and entered in the key-way.

What I claim t0 be new is:

1. A safety attachment and locking device for power presses, comprising, in combination with the frame of/a power press, a pivotal spring pressed trip lever, a trip operating rod, a yoke fastened to said rod, a longitudinally movable guard and support therefor, a spring pressed guard risng 1e for power resses, comprising, in combination with t e frame of a power press, a piv- Y otal spring pressed trip lever, a longitudinally movab e trip operating rod with a yoke at one end and a bar pivotally connecting said yrod and lever, a bearin for said rod, a lever4 pivoted to the yo e, a spring actuated latch adapted tol normally lock said rod, a shell in which one end of the latch is mounted, a guard provided with a tubular portion having a longitudinal movement in said shell, a key adjustably connected to said tubular portion and provided with a notch to be engaged by one end of.

the latch, said guard being elevated bythe lever which is pivoted to the yoke, as set forth. v

3.' A safety attachment and locking device for power presses comprising, in combination with the frame of a ower press, a pivotal spring pressed trip lgver, a casting for attachment to the frame, a notched rod movable through said casting and having a slotted yoke at one end, a sprin pressed lever pivoted to the yoke, a trea pivotally connectingv the .latter and lever which is pivoted to the yoke, a tube ro- ]'ectng from said casting, a shell secure to said tube,v the walls of the shell and'castn being apertured, a rin ressed latc mounted to have a long1tud1na movement in said apertures and designed to engage the notch in said rod, a guard having a tubular shaft which is apertured, a notched ke adjustably connected to said tubular sha and movable inea key-way in said shell said key adapted to be engaged frictionally by one end of the latch, a stud projecting from the tubular shaft, and an anti-friction wheel ournaled upon the studand engaged by the ever which is pivoted to the yo e.

lever, a rodl 4. A safety attachment and locking dei in from said castin a shell secured tosaid tu e, the walls of t e shell and casting being apertured, a spring pressedlatch enga ing lsaidapertures, one end of the latc y' adapted to enter the notch in said rod',a guard having a erforated tubular shaft slidable in said sh a notched key movable in a key-Way in said shaft, said key having a lug 'adapted to engage the vperforations of sald tubular shaft, a stud carried by the tubular' shaft, and an anti-friction wheel journaled upon the stud and against which said lever plvoted to the yoke is adapted to contact.

5. A safety attachment and locking device for power presses comprising, in combination with the frame of a power presstapiv-l otalfs'pring actuated trip lever, a casting secured to the frame, a notched rod movable in said casting and havin a yoke at one end with an elongated slot t erein, connections between said rod and trip lever, a spring pressed lever pivoted to said yoke and having a swinging movement in said slot, tread lever and connections between the sameand the leverAwhichmishpiyoted tothe yoke, a

tube fastened to said casting, a shell secured to one end of the tube, said tube and shell having registering apertures, pressed latch movable in said apertures, a ey movable in a suitable key-way in said shell and provided with a projecting lug and y BERTRAND BEYER.-

Witnesses:

WILLIAM S'ronxnn, AnoLF GENT.

a spring'A 

